将 object 和数组作为多播类型传递到 Angular 2 的 function 参数的问题（打字稿问题）

Question

My problem is very simple. I want to pass an object (of Class CircuitBreaker) into my arguments. I want it to be reusable, however, so I would like to also use | to pass an array of this same Class as well.

This creates syntax errors where the compiler is confused on accepting array functions (such as.some)

Property 'some' does not exist on type 'CircuitBreakerThresholdBreakdown | CircuitBreakerThresholdBreakdown[]

and/or a property of a potential object:

Property 'threshold' does not exist on type 'CircuitBreakerThresholdBreakdown | CircuitBreakerThresholdBreakdown[]

What am I missing here?

public thresholdFunction(cBreakdowns: CircuitBreaker | CircuitBreaker[]): boolean {
    if (cBreakdowns.length > 1) {
        return cBreakdowns.some(singleBreakdown => {
            return singleBreakdown.breakdown.count > singleBreakdown.threshold.maximum ||
            singleBreakdown.breakdown.count < singleBreakdown.threshold.minimum;
        });
    } else {
        return cBreakdowns.breakdown.count < cBreakdowns.threshold.minimum;
    }
}

Answer 1

Modify your if statement this way:

if (cBreakdowns instanceof Array) {
 // ...
} else {
 // ...
}

Answer 2

You can use spread operator in paramter (...) .

• When calling the function if you want to pass object then use thresholdFunction(obj); .
• If you want to pass array use thresholdFunction(...array); . And update your code like below.
• You can also pass multiple objects with thresholdFunction(obj1, obj2, obj3);

---

public thresholdFunction(...cBreakdowns: CircuitBreaker[]): boolean {
    return cBreakdowns.some(singleBreakdown => {
        return singleBreakdown.breakdown.count > singleBreakdown.threshold.maximum ||
            singleBreakdown.breakdown.count < singleBreakdown.threshold.minimum;
    });
}